Development characteristics and petroleum geological significance of Permian pyroclastic flow volcanic rocks in Western Sichuan Basin, SW China

PENG Hao,YIN Cheng,HE Qinglin,XIA Guoyong,LIU Yong,MA Tinghu,CHEN Kang,LIU Ran,SU Wang

Fig. 1. Distribution of early stage of Late Permian volcanic rock in southwest China (a), composite column of Cambrian-Triassic strata in Western Sichuan Basin (b), and distribution of Late Permian basalt and eruption mechanism in Western Sichuan Basin (c). UI—Top of mantle plume intrusion; CD—Conrad discontinuity; CB—Top of crystallization base; MOHO—Moho discontinuity.